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Stock-Based Compensation - UScellular, Overview (Details) - UScellular - Common Shares - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UScellular Long-Term Incentive Plans
Stock-based compensation, overview
Shares reserved	11,370,000
Non-Employee Directors' Plan
Stock-based compensation, overview
Shares reserved	84,000
Shares issued	20,000	19,000	13,000

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Number of shares authorized for issuance under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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